臺灣博碩士論文加值系統

鈮酸鉀為一強電性之鈣鈦礦結構材料，在製作其陶瓷體時，由於其燒結溫度需接近其熔點之高溫(1054℃)，在此高溫時造成大量氧化鉀的揮發而使其不易燒結，因此我們可藉由摻雜少量鋰作為助熔劑降低其燒結溫度助其燒結，並就此一鈮酸鋰鉀系列之陶瓷體做其物性及電性分析。
　　鈮酸鈉為一反強電性材料，在此我們將之與強電性之鈮酸鉀組成鈮酸鉀鈉之多元之陶瓷體，實驗結果顯示在鈉與鋰為1:1時，可得到高達34.55%之徑向振動耦合因數。
最後我們將由前兩多元系統結果中，試圖研製綜合二者優點之多元陶瓷體，並就其壓電特性做一討論。

Potassium niobate (KNbO3) is a ferroelectric material of perovskite structure. However, it is difficult to synthesize pure KNbO3 ceramics since the sintering temperature (1054˚C) is very close to the melting point of KNbO3 ceramics that causes severe volatilization of K2O. Li dopant is introduced as an additive, which forms liquid phase to help to reduce the sintering temperature. Characteristics of material and electrical properties of the Lithium potassium niobate (LixK1-xNbO3) ceramics are investigated.
Sodium niobate (NaNbO3) is an antiferroelectric material. In the second phase of our research, we introduce Sodium niobate in the Potassium niobate system to form Sodium Potassium niobate (NaxK1-xNbO3) ceramics. According to our experimental results, high radial coupling coefficients (34.55%) are obtained for the compound having up to 50mol% sodium niobate.
Finally, the ternary system that mixes Lithium potassium niobate and Sodium Potassium niobate ceramic is introduced. The characteristics of the piezoelectric property are investigated, also.

第一章 緒論...................................01
第二章 原理...................................03
2-1 壓電效應...................................03
2-2 壓電方程式.................................05
2-3 壓電諧振體.................................07
2-4 壓電材料之種類與ABO3陶瓷材料...............09
2-5 壓電特性參數...............................12
第三章 製程與量測.............................15
3-1 陶瓷體的製備...............................15
3-2 分析與測量.................................17
第四章 結果與討論.............................23
4-1 鈮酸鋰鉀系列之多元陶瓷體特性探討...........23
4-2 鈮酸鈉鉀系列之多元陶瓷體特性探討...........28
4-3 鈮酸鋰鈉鉀系列之多元陶瓷體特性探討.........32
第五章 結論...................................34
附圖...........................................36
參考文獻.......................................90

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